schema

SenderPCheckTable:
(courier, recipient) | SenderPCheckProtoData { ... }
CourierPCheckTable
(sender, recipient) | CourierPCheckProtoData { ... }
RecipientPCheckTable
(sender, courier) | RecipientPCheckProtoData { ... }

SenderPCheckProtoData {
  courier_encrypted_pairs: [PaillierCyphertext; 128]
  recipient_encrypted_pairs: [PaillierCyphertext; 128]

  courier_A_shares: [ShamirShare; 128]
  courier_B_shares: [ShamirShare; 128]

  recipient_A_shares: [ShamirShare; 128]
  recipient_B_shares: [ShamirShare; 128]

  courier_to_recipient_X2_shares: [ShamirShare; 64]
  courier_to_recipient_Y2_shares: [ShamirShare; 64]
  courier_to_recipient_X_shares: [ShamirShare; 64]
  courier_to_recipient_Y_shares: [ShamirShare; 64]
}